9-13 July 2012
Conversion of FeCl3 into FeSi fibrous structures at high temperature for gas sensing applications
Presented by Mr. SIBONGISENI THABETHE on 10 Jul 2012 from 14:50 to 15:10
Type: Oral Presentation
Track: Track A - Division for Condensed Matter Physics and Materials
FeSi belongs to a class of narrow gap semiconductors and as a result it has been studied for more than 30 years because of its unusual properties such as its metal to insulator transition (MIT) in temperatures near 300K and the strong dependence of the magnetic susceptibility on the temperature [1,2]. The transitioning property of this material makes it an ideal candidate in the field of gas sensing We report on the synthesis of FeSi nanostructure on silicon substrates using thermal chemical vapor deposition method. Anhydrous FeCl<sub>3</sub> powder was used as the precursor, N<sub>2</sub> gas was used to carry the precursor vapors to the silicon substrates which were placed at temperatures of 1100oC in a horizontal quartz tube furnace. Scanning electron microscopy images revealed fibrous structures made of single interwoven FeSi nanowires. XRD results confirm that the nanowires are FeSi with a B20 cubic crystal structure. References  L.Ouyang,E.S. Thrall,M.M. Deshmukh, H. Park (2006). Advanced Materials,18, 1437-1440.  J.R Szczech, S. Jin. Journal of Material Chemistry, 2010, 20, 1375-1382.
Dr. Bonex Mwakikunga BMwakikunga@csir.co.za